import java.util.Scanner;
 
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        scanner.nextLine(); // Consume newline
        String colors = scanner.nextLine().trim();
        long sumR = 0, sumG = 0, sumB = 0;
        for (int i = 0; i < n; i++) {
            long w = scanner.nextLong();
            char c = colors.charAt(i);
            if (c == 'R') sumR += w;
            else if (c == 'G') sumG += w;
            else sumB += w;
        }
        long total = sumR + sumG + sumB;
        long max = Math.max(sumR, Math.max(sumG, sumB));
        System.out.println(total - max);
    }
}

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NApSR0JSCjMgMSAyIDQgCjEgMgoyIDMKMiA0

4
RGBR
3 1 2 4 
1 2
2 3
2 4